Claire, most of them can be found in the Swatches menu > Swatch Libraries Menu (lower left corner in the panel) > Patterns > Basic Graphics > Lines.
Or can be created with simple lines and Object > Pattern > Make...
Don't try to make them under a 45 degree angle, just make horizontal versions an use the Rotate tool to transform them with the Pattern only option checked.
Claire, most of them can be found in the Swatches menu > Swatch Libraries Menu (lower left corner in the panel) > Patterns > Basic Graphics > Lines.
Or can be created with simple lines and Object > Pattern > Make...
Don't try to make them under a 45 degree angle, just make horizontal versions an use the Rotate tool to transform them with the Pattern only option checked.